MP620 T32-6 strange X-axis problem

I dont know how to describe this problem that only seems to happen when the machine is warm (like 10 hours of work)
It will change a little bit in X axis and if I dont notice it it will change more.
All tools on that turret is affected and a reboot will reset it to normal.

In this film I have notice it when is "only" moved 0,075mm but I have seen 0,3mm aswell.
Before reboot X is at 0, after reboot X is at -0,075 but the turret have not moved.
(No there is no backlash at this axle)

How did you find this problem, part sizes varying? Have you checked the x-axis encoder coupling, I've just had a problem with inconsistent diameters that turned out to be a loose grub screw on the encoder, almost sent me mental....

How did you find this problem, part sizes varying? Have you checked the x-axis encoder coupling, I've just had a problem with inconsistent diameters that turned out to be a loose grub screw on the encoder, almost sent me mental....

Yes, both ID & OD is getting smaller.
I thought about that since I had that problem before on another machine but then it should not go back to normal by a reboot.

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